document.writeln("<!DOCTYPE html>");
document.writeln("<html lang=\'en\'>");
document.writeln("<head>");
document.writeln("	<meta charset=\'UTF-8\'>");
document.writeln("	<title>foot</title>");
document.writeln("</head>");
document.writeln("<body>");
document.writeln("	<div style=\'background-color:yellow;width:200px;height:200px;margin:auto;\'>我是尾部</div>");
document.writeln("</body>");
document.writeln("</html>");